A new and natural move.
11. a1d1  11... d8c7 The queen takes an alternative route. 12. h2h3  12... a7a6 Preparing c6-c5 without White having Nb5. Another plan is Rad8-Qb8. 13. f1e1 This doesn't seem like the scariest of moves, but the problem for White in this line is that the e3-e4 advance isn't that promising and patience is needed.